The second male lead in the book. Due to him being a main character in the original novel, Chae-Rin is able to see him. After the zombie outbreak, he leads a band of male students, including the student who killed the Unknown Extra. His group gains control of the school snack shop and he uses a BB gun to defend himself. He is also the twin brother of Chae-Rin's classmate Seon-U Ha.